$(function)(){
  //get elem
  let $btn = $('input[type=button]'),
      delay = 6,
      timer = null;
  
  //init status:disable,text,delay
  $btn.val('同意('+delay+'s)');
  $btn.attr('disabled','disabled');
  
  //start timer,timeout button enable
  timer = setInterval(()=>{
    //delay>0
    //set btn text
    //delay --
    //delay=0 set btn enable
    $btn.val('同意('+ --delay + 's)');
    if(delay === 0){
      clearInterval(timer);
      $btn.val('同意');
      $btn.removeAttr('disable');
    }
  },1000)
  
  //click event
  $btn.click(()=>{
    alert('button clicked!')
  })
}
